/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2017-2025 Ta4j Organization & respective
 * authors (see AUTHORS)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.ta4j.core.num;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;

import java.math.MathContext;
import java.math.RoundingMode;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;

class DecimalNumPrecisionConfigurationTest {

    @AfterEach
    void restoreDefaults() {
        DecimalNum.resetDefaultPrecision();
    }

    @Test
    void configureDefaultPrecisionUpdatesValueOf() {
        DecimalNum.configureDefaultPrecision(18);

        final var num = DecimalNum.valueOf("1.2345");

        assertEquals(18, num.getMathContext().getPrecision());
    }

    @Test
    void configureDefaultMathContextUpdatesRoundingMode() {
        final var mathContext = new MathContext(12, RoundingMode.DOWN);
        DecimalNum.configureDefaultMathContext(mathContext);

        final var num = DecimalNum.valueOf("1.23456789");

        assertEquals(RoundingMode.DOWN, num.getMathContext().getRoundingMode());
        assertEquals(12, num.getMathContext().getPrecision());
    }

    @Test
    void factoryReflectsConfiguredPrecision() {
        DecimalNum.configureDefaultPrecision(22);

        final var factory = DecimalNumFactory.getInstance();
        final var num = (DecimalNum) factory.numOf("3.14159");

        assertEquals(22, num.getMathContext().getPrecision());
        assertEquals(22, ((DecimalNum) factory.one()).getMathContext().getPrecision());
        assertEquals(22, ((DecimalNum) factory.hundred()).getMathContext().getPrecision());
    }

    @Test
    void factoryWithExplicitContextUsesPrecisionForConstants() {
        final var customContext = new MathContext(28, RoundingMode.HALF_EVEN);
        final var factory = DecimalNumFactory.getInstance(customContext);

        final var num = (DecimalNum) factory.numOf("2.718281828");

        assertEquals(customContext, num.getMathContext());
        assertEquals(customContext, ((DecimalNum) factory.minusOne()).getMathContext());
        assertEquals(customContext, ((DecimalNum) factory.thousand()).getMathContext());
    }

    @Test
    void configuringInvalidPrecisionFails() {
        assertThrows(IllegalArgumentException.class, () -> DecimalNum.configureDefaultPrecision(0));
    }
}
